Guide and drainage system for refuse landfill

Abstract

The utility model discloses a refuse landfill guiding and discharging system which comprises a percolate flow guide layer, an impermeable layer, an underground water flow guide layer and a base layer which are sequentially arranged below a refuse landfill layer, a first groove is formed in the bottom of the percolate flow guide layer, a first guiding and discharging pipe is installed in the first groove, and the periphery of the first guiding and discharging pipe is filled with first washing gravel. The outer side of the first washed gravel is coated with filtering fibers, the underground water flow guide layer is filled with second washed gravel, a second groove is formed in the bottom of the underground water flow guide layer, a second drainage pipe is installed in the second groove, and the first drainage pipe and the second drainage pipe each comprise a circular-ring-shaped plastic body and fan-shaped protrusions annularly distributed on the periphery of the plastic body. The plastic body and the fan-shaped protrusions are integrally formed. The guide and drainage system for the refuse landfill has the advantages of being high in guide and drainage speed, long in service life, not prone to blockage and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of garbage disposal, in particular to a landfill drainage system. Background Art

[0002] The initial moisture content of my country's garbage is high (the domestic average moisture content is 52%, and the average in Western countries is 27%), especially the high organic matter content. After the garbage is landfilled, as the garbage is mechanically compressed and the organic matter is degraded, the moisture in the garbage gradually precipitates to produce leachate.

[0003] Domestic waste sanitary landfills must be equipped with leachate drainage systems and groundwater drainage systems. The leachate drainage system timely drains the leachate in the landfill area to the outside of the reservoir area, timely lowers the leachate water level, and ensures the safety of the garbage dam and the reservoir area. The groundwater drainage system is used to collect and drain groundwater to prevent the reverse infiltration of groundwater, which will lead to the expansion of the leachate treatment scale. The existing landfill drainage system has the disadvantages of poor drainage effect and easy clogging of the pipeline, which needs to be further improved. Utility Model Content

[0004] The utility model aims to provide a landfill drainage system to solve the problems existing in the prior art.

[0005] The purpose of the utility model is achieved as follows: A landfill drainage system comprises a leachate diversion layer, an impermeable layer, a groundwater diversion layer and a foundation layer which are sequentially arranged below the landfill layer, a first groove is provided at the bottom of the leachate diversion layer, a first drainage pipe is installed in the first groove, the first drainage pipe is filled with first water-washed gravel around, the first water-washed gravel is coated with filter fiber on the outside, the groundwater diversion layer is filled with second water-washed gravel, a second groove is provided at the bottom of the groundwater diversion layer, a second drainage pipe is installed in the second groove, the first drainage pipe and the second drainage pipe both comprise an annular plastic body and fan-shaped protrusions arranged around the outer periphery of the plastic body, and the plastic body and the fan-shaped protrusions are integrally formed.

[0006] In the landfill drainage system of the utility model, the leachate and groundwater enter the corresponding drainage pipe after multiple filtrations, which is not easy to be blocked. In addition, since the drainage pipe adopts a plastic blind ditch, it has the advantages of good water permeability, good anti-leakage performance, and long service life. In addition, by improving the structure of the plastic blind ditch, a fan-shaped protrusion of a ring cloth is set outside the annular plastic body, which avoids the reduction of the void ratio of the drainage pipe due to excessive pressure of the diversion layer. At the same time, the space between the drainage pipe and the filter fiber is increased, and the drainage efficiency between the two is improved. In summary, the landfill drainage system of the utility model has the advantages of fast drainage speed, long service life, and not easy to be blocked.

[0007] As a further improvement of the utility model, the first water-washed gravel fills the first groove and forms a semicircular protrusion on the upper side of the first groove, and the diameter of the semicircular protrusion is greater than the width of the first groove, thereby improving the filtering effect on the leachate and preventing the drainage pipe from being blocked.

[0008] As a further improvement of the utility model, the vertical gap between the first drainage pipe and the first groove is not less than 50 mm, ensuring that the first washed gravel has sufficient thickness around the drainage pipe to improve the filtering effect. At the same time, the first drainage pipe is completely located in the first groove, which is also conducive to promoting the drainage efficiency of the leachate.

[0009] As a further improvement of the utility model, the leachate diversion layer is filled with crushed stones with a particle size of 20 to 60 mm, and the upper part of the leachate diversion layer is paved with 200 g / m 2 Needle-punched long-fiber polyester non-woven geotextile, filter fiber uses 300g / m 2 Needle-punched long-fiber polyester non-woven geotextile ensures the leachate filtration effect and prevents the first drainage pipe from being blocked.

[0010] As a further improvement of the utility model, the anti-seepage layer is made of compacted clay, and an anti-seepage liner layer is laid on the top of the anti-seepage layer. The anti-seepage liner layer is composed of HDPE anti-seepage membrane, compacted clay and GCL liner. By adopting the composite geomembrane liner with a special structure, a good anti-seepage effect is achieved to prevent leachate from polluting groundwater.

[0011] As a further improvement of the utility model, the groundwater diversion layer is filled with gravel with a particle size of 15-40 mm, the upper part of the groundwater diversion layer is laid with 400g / m2 needle-punched long-fiber polyester non-woven geotextile, and the lower part is laid with 200g / m2 needle-punched long-fiber polyester non-woven geotextile. The base layer uses compacted clay to ensure the filtering effect of groundwater and prevent the second drainage pipe from being blocked.

[0012] As a further improvement of the utility model, the first drainage pipe and the second drainage pipe both include a main pipe and a branch pipe, the branch pipes are distributed in a fishbone shape on both sides of the main pipe, the inclination of the branch pipe and the main pipe is not less than 5%, the branch pipe and the main pipe are at an angle of 60°, and the branch pipes are arranged at intervals of 40 m along the main pipe, with a fast drainage speed and high drainage efficiency, which prevents the accumulation of leachate or groundwater at the bottom of the reservoir. A liquid collection well is connected to the downstream of the main pipe of the first drainage pipe, and the liquid collection well is connected to the regulating tank through a pumping pipeline. A lifting pump is provided on the pumping pipeline to facilitate the subsequent treatment of the leakage liquid, and the entire drainage pipeline can be easily flushed by backwashing to avoid blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional schematic diagram of the landfill drainage system of the utility model.

[0014] Figure 2It is a top view of the landfill drainage system of the utility model.

[0015] Among them, 1 is the landfill layer, 2 is the leachate diversion layer, 3 is the anti-seepage layer, 4 is the groundwater diversion layer, 5 is the foundation layer, 6 is the first drainage pipe, 7 is the first water-washed gravel, 8 is the filter fiber, 9 is the second water-washed gravel, 10 is the second drainage pipe, 11 is the main pipe, 12 is the branch pipe, 13 is the liquid collecting well, and 14 is the lifting pump room. DETAILED DESCRIPTION

[0016] like Figure 1-2 The landfill drainage system shown comprises a leachate diversion layer 2, an anti-seepage layer 3, a groundwater diversion layer 4 and a foundation layer 5 which are sequentially arranged below a landfill layer 1.

[0017] A first groove is provided at the bottom of the leachate diversion layer 2, and a first drainage pipe 6 is installed in the first groove. The first drainage pipe 6 is filled with first water-washed gravel 7 around it, and the first water-washed gravel 7 is coated with filter fiber 8 on the outside. The first water-washed gravel 7 fills the first groove and forms a semicircular protrusion on the upper side of the first groove, and the diameter of the semicircular protrusion is greater than the width of the first groove, which improves the filtering effect on the leachate and prevents the drainage pipe from being blocked. The vertical gap between the first drainage pipe 6 and the first groove is not less than 50 mm, ensuring that the first water-washed gravel 7 has sufficient thickness around the drainage pipe to improve the filtering effect. At the same time, the first drainage pipe 6 is completely located in the first groove, which is also conducive to promoting the drainage efficiency of the leachate.

[0018] The leachate diversion layer 2 is filled with crushed stones with a particle size of 20-60 mm, and the upper part of the leachate diversion layer 2 is paved with 200 g / m 2 Needle-punched long-fiber polyester non-woven geotextile, filter fiber 8 uses 300g / m 2 The needle-punched long-fiber polyester non-woven geotextile ensures the leachate filtering effect and prevents the first drainage pipe 6 from being blocked.

[0019] The anti-seepage layer 3 is made of compacted clay, and an anti-seepage liner layer is laid on the top of the anti-seepage layer 3. The anti-seepage liner layer is composed of HDPE anti-seepage membrane, compacted clay and GCL liner. By using the composite geomembrane liner with a special structure, a good anti-seepage effect is achieved to prevent leachate from polluting groundwater.

[0020] The groundwater diversion layer 4 is filled with second washed gravel 9, and a second groove is provided at the bottom of the groundwater diversion layer 4, in which a second drainage pipe 10 is installed. The groundwater diversion layer 4 is filled with gravel with a particle size of 15-40 mm, and a 400g / m2 needle-punched long-fiber polyester non-woven geotextile is laid on the upper part of the groundwater diversion layer 4, and a 200g / m2 needle-punched long-fiber polyester non-woven geotextile is laid on the lower part to ensure the filtering effect of groundwater and prevent the second drainage pipe 10 from being blocked. The base layer 5 is made of compacted clay.

[0021] The first drainage pipe 6 and the second drainage pipe 10 both include a circular plastic body and a fan-shaped protrusion that is arranged around the outer periphery of the plastic body, and the plastic body and the fan-shaped protrusion are formed in one piece. That is, the first drainage pipe 6 and the second drainage pipe 10 both use a plastic blind ditch formed by curling, entanglement and bonding of plastic filament bundles, which has the advantages of good water permeability, good anti-leakage performance and long service life. And by improving the structure of the plastic blind ditch in the prior art, the fan-shaped protrusion that is arranged around the circular plastic body avoids the reduction of the porosity of the plastic blind ditch due to excessive pressure of the guide layer, and at the same time increases the space between the first drainage pipe 6 and the filter fiber 8, and between the second drainage pipe 10 and the second water-washed gravel 7, thereby improving the drainage efficiency between the two.

[0022] like Figure 2 As shown, the first drainage pipe 6 and the second drainage pipe 10 (located at the lower layer of the first drainage pipe 6, not shown) both include a main pipe 11 and a branch pipe 12. The branch pipes 12 are distributed in a fishbone shape on both sides of the main pipe 11. The inclination of the branch pipes 12 and the main pipe 11 is not less than 5%. The branch pipes 12 and the main pipe 11 are at an angle of 60°. The branch pipes 12 are arranged at intervals of 40 m along the main pipe 11. The drainage speed is fast and the drainage efficiency is high, which prevents the accumulation of leachate or groundwater at the bottom of the reservoir. A liquid collection well 13 is connected to the downstream of the main pipe 11 of the first drainage pipe 6. The liquid collection well 13 is connected to the regulating tank through a pumping pipeline. A lifting pump is provided on the pumping pipeline to facilitate the subsequent treatment of the leakage liquid, and the entire drainage pipeline can be easily flushed by backwashing to avoid blockage.

[0023] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present utility model, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. A landfill drainage system, comprising a leachate diversion layer, an impermeable layer, a groundwater diversion layer and a foundation layer arranged in sequence below a landfill layer, characterized in that: A first groove is provided at the bottom of the leachate diversion layer, a first drainage pipe is installed in the first groove, the first drainage pipe is filled with first water-washed gravel around, the first water-washed gravel is coated with filter fiber on the outside, the groundwater diversion layer is filled with second water-washed gravel, a second groove is provided at the bottom of the groundwater diversion layer, a second drainage pipe is installed in the second groove, the first drainage pipe and the second drainage pipe both include a circular plastic body and fan-shaped protrusions arranged around the periphery of the plastic body, and the plastic body and the fan-shaped protrusions are integrally formed.

2. The landfill drainage system according to claim 1, characterized in that: The first water-washed gravel fills the first groove and forms a semicircular protrusion on the upper side of the first groove, and the diameter of the semicircular protrusion is greater than the width of the first groove.

3. The landfill drainage system according to claim 2, characterized in that: The vertical gap between the first guide pipe and the first groove is not less than 50 mm.

4. The landfill drainage system according to claim 1, characterized in that: The leachate diversion layer is filled with crushed stones with a particle size of 20 to 60 mm, and the upper part of the leachate diversion layer is paved with 200 g / m 2 Needle-punched long-fiber polyester non-woven geotextile, the filter fiber adopts 300g / m 2 Needle punched long fiber polyester non-woven geotextile.

5. The landfill drainage system according to claim 1, characterized in that: The anti-seepage layer is made of compacted clay, an anti-seepage lining layer is laid on the top of the anti-seepage layer, and the anti-seepage lining layer is composed of a HDPE anti-seepage membrane, compacted clay and a GCL lining.

6. The landfill drainage system according to claim 1, characterized in that: The groundwater diversion layer is filled with gravel with a particle size of 15-40 mm. The upper part of the groundwater diversion layer is paved with 400g / m2 needle-punched long-fiber polyester non-woven geotextile, and the lower part is paved with 200g / m2 needle-punched long-fiber polyester non-woven geotextile. The base layer is made of compacted clay.

7. The landfill drainage system according to any one of claims 1 to 6, characterized in that: The first drainage pipe and the second drainage pipe both include a main pipe and a branch pipe, the branch pipes are distributed in a fishbone shape on both sides of the main pipe, the inclination slope of the branch pipe to the main pipe is not less than 5%, the branch pipe forms an angle of 60° with the main pipe, and the branch pipes are arranged at intervals of 40 m along the main pipe. A liquid collecting well is connected to the downstream of the main pipe of the first drainage pipe, and the liquid collecting well is connected to the regulating tank through a pumping pipeline, and a lifting pump is provided on the pumping pipeline.

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